Plug wire removal on 2002 GMC Yukon

Is there a special tool or trick to getting the plug wires off? I have pulled and twisted them with no luck. mine have a metal sleeve around the plug boot.

1 answer 1 comment
I don't know of a special tool but anytime you have the spark plugs and plug wires separated apply some di-electric grease to the inside of the spark plug boots to prevent this difficulty in separating the plug wires from the plugs again.
thats a great idea. but i still have the problem of not being able to remove the spark plug. do i just pull and pull and hope nothing breaks or what?